Gaining a better understanding of the limiting factors for the existence of stable, superheavy elements is a decade-old quest of chemistry and physics. Superheavy elements, as are called the chemical elements with atomic numbers greater than 103, do not occur in nature and are produced artificially with particle accelerators. They vanish within seconds.
Click here for original story, The new heavy isotope mendelevium-244 and a puzzling short-lived fission activity
Source: Phys.org